Thornton, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thornton, a community in San Joaquin County, California.
This Afternoon
62°F
Chance Light Rain
A chance of rain before 5pm. Partly sunny. High near 62, with temperatures falling to around 58 in the afternoon. East wind 2 to 7 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Thornton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 62°F | Chance Light Rain | 2 to 7 mph E | 31% |
| Tonight | 46°F | Partly Cloudy | 2 to 9 mph N | 13% |
| Wednesday | 68°F | Sunny | 5 to 10 mph NNW | 0% |
| Wednesday Night | 45°F | Mostly Cloudy then Patchy Fog | 1 to 5 mph WNW | 0% |
| Thursday | 71°F | Mostly Sunny | 2 to 8 mph NNW | 0% |
| Thursday Night | 43°F | Mostly Clear then Patchy Fog | 0 to 3 mph NNW | 0% |
| Friday | 71°F | Areas Of Fog then Sunny | 0 to 3 mph NNW | 0% |
| Friday Night | 44°F | Clear | 1 mph N | 0% |
| Saturday | 74°F | Sunny | 2 mph N | 0% |
| Saturday Night | 46°F | Mostly Clear | 1 mph NW | 0% |
| Sunday | 73°F | Mostly Sunny | 1 to 5 mph NW | 0% |
| Sunday Night | 47°F | Partly Cloudy | 2 mph NNW | 0% |
| Monday | 71°F | Partly Sunny | 0 to 3 mph W | 1% |
| Monday Night | 47°F | Partly Cloudy | 0 to 3 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Thornton (38.230, -121.426). Updated through the day.
Growing snapshot for Thornton
Last spring frost
Feb 9
First fall frost
Dec 5
Growing season
301 days
Hardiness zone
9b
More local growing data for Thornton: nearby ZIP 95242 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Lodi, Ca (5.7 mi from Thornton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.